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Equity method investments - Unaudited financial information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2025 | Jun. 30, 2025 | Jun. 28, 2025 | Sep. 30, 2024 | Sep. 28, 2024 | Jun. 30, 2024 | Jun. 28, 2025 | Sep. 30, 2025 | Jun. 30, 2025 | Sep. 30, 2024 | Sep. 28, 2024 | Jun. 30, 2024 | Dec. 31, 2024 | Dec. 28, 2024
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets | $ 1,225,963 |  |  |  |  |  |  | $ 1,225,963 |  |  |  |  | $ 1,153,881 |
Liabilities | 525,522 |  |  |  |  |  |  | 525,522 |  |  |  |  | $ 502,226 |
Sales/ Total revenues and other income | $ 94,972 |  |  | $ 92,995 |  |  |  | $ 277,212 |  | $ 276,517 |  |  |  |
Occidental Petroleum Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  | $ 84,360 |  | 85,803 |  |  |  |  | $ 84,360 | 85,803 |  |  |  |
Liabilities |  | 48,184 |  | $ 50,869 |  |  |  |  | 48,184 | $ 50,869 |  |  |  |
Sales/ Total revenues and other income |  | 6,456 |  |  |  | $ 6,879 |  |  | 20,136 |  |  | $ 20,418 |  |
Net earnings attributable to common shareholders |  | $ 288 |  |  |  | $ 992 |  |  | $ 757 |  |  | $ 2,739 |  |
The Kraft Heinz Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  | $ 81,581 |  |  |  | $ 81,581 |  |  |  |  |  |  | $ 88,287
Liabilities |  |  | 40,089 |  |  |  | 40,089 |  |  |  |  |  |  | $ 38,962
Sales/ Total revenues and other income |  |  | 6,352 |  | $ 6,383 |  | 12,351 |  |  |  | $ 19,270 |  |  |
Net earnings attributable to common shareholders |  |  | $ (7,824) |  | $ (290) |  | $ (7,112) |  |  |  | $ 613 |  |  |

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